Considering mods, whether you like it or not, are a massive reasons for these games’ lasting appeal, yeah I’d consider it a big deal. You may not use mods, and hey good for you, but the billions of downloads from Nexus mods solely for these games in particular shows that many others do.

Regardless, ignoring all of that, the Skyrim Script Extender Team was in contact with Bethesda before Special Edition released, giving them time to work on an SE version for when the day came. So it was perfectly reasonable for the Fallout Script Extender Team to expect the same.